s/diferent/different/

Since the C standard allows for intermediate floating results to contain
more precision bits than the data type expects, but (kind of obviously)
does not allow such values to be stored in memory, exp

Since the C standard allows for intermediate floating results to contain
more precision bits than the data type expects, but (kind of obviously)
does not allow such values to be stored in memory, expecting the value
returned from strtod() (an intermediate result) to be identical (that is,
equal) to a stored value is incorrect.

So instead go back to checking that the two numbers are very very close.
See comments added to the test for more explanation.

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Revert 1.4 (perhaps temporarily) and add even more diagnostics to those
added in 1.3 to see if it is possible to determine why the strict equality
test fails on i386, yet succeeds elsewhere.

When comparing doubles (any floating point values) which have been
computed using different methods, don't expect to achieve identical
results (here, one constant is perhaps converted to binary from

When comparing doubles (any floating point values) which have been
computed using different methods, don't expect to achieve identical
results (here, one constant is perhaps converted to binary from a string by
a cross compiler, the other is converted at run time). Allow them to
have a small difference (for now, small is < 1e-7 - the constant is ~ 1e5,
so this is 12 orders of magnitude less) before failing (and include the
actual difference in the error message if it does fail.)

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Add some diagnostics to the strto test, so I can see why this
fails on i386 (on qemu) - will probably keep them when done.

Add ISO10646 versions of these tests, conditional on __STDC_ISO_10646__ .
Also make the tests a bit more verbose, to aid debugging when they fail.

Change t_sprintf to an expected failure, since we don't respect the empty
thousands separator of the C/POSIX locale (PR standards/52282).

Add test cases for sprintf/sscanf/strto{d,l} and the is* and isw* ctype functions, for single-byte encodings